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Table 2 The pregnant women’s vitamin D status in the first (T1) and third (T3) trimester of pregnancy, and their characteristics (mean or percent) grouped by 25OHD concentration in (T1)

From: Trajectory of vitamin D status during pregnancy in relation to neonatal birth size and fetal survival: a prospective cohort study

T1 25OHD (nmol/L) < 30 30–49.9 50–74.9 75–99.9 ≥ 100
N 198 291 788 565 125
% 10.1 14.8 40.1 28.7 6.4
BMI T1 (kg/m2) 25.1 24.9 24.4 23.9 24.4
Age T1 (years) 29.4 30.9 31.6 32.0 32.4
Born in Sweden (%) 14.1 54.6 83.3 87.8 93.5
Tobacco use T1 (%) 6.8 4.6 4.0 4.6 1.6
Nulliparous T1 (%) 34.8 42.0 42.6 43.1 42.7
Vitamin D supplement use T1 (%) 10.6 28.2 45.2 56.6 62.9
University level education (%) 32.3 54.9 61.3 67.3 66.1
Small for gestational age (%) 5.7 4.2 5.3 4.1 4.0
Preterm delivery (%) 4.1 5.2 3.8 3.9 1.6
Low birth weight (%) 3.0 4.5 3.1 2.1 1.6
Pregnancy loss (%) 6.3 5.6 4.5 5.1 0
T3 25OHD (nmol/L) < 30 30–49.9 50–74.9 75–99.9 ≥ 100
N 163 330 473 409 443
% 9.0 18.2 26.0 22.5 24.4
Small for gestational age (%) 7.5 5.5 4.7 4.6 2.3
Preterm delivery (%) 4.3 1.2 3.6 2.2 1.6
Low birth weight (%) 4.3 0.3 2.7 1.2 1.4
  1. T1 first trimester, T3 third trimester, 25OHD 25-hydroxyvitamin D